White Mountains Insurance market cap WTM

Share price times shares outstanding: what the whole company sells for, since 2010.

White Mountains Insurance is worth $5.3B at the close on Oct 23, 2026, at $2,225.24 a share.

That is up 8% over the last year and up 62% over five years.

Its highest close in our data was $5.7B in Apr 2026.

Market cap over time

Year	End of year	Low	High	Change
2026 so far	$5.3B	$4.8B	$5.7B	+1%
2025	$5.3B	$4.4B	$5.3B	+7%
2024	$4.9B	$3.8B	$5.2B	+28%
2023	$3.9B	$3.4B	$4.1B	+6%
2022	$3.6B	$3.1B	$4.1B	+19%
2021	$3.1B	$3B	$3.8B	−1%
2020	$3.1B	$2.2B	$3.7B	−11%
2019	$3.5B	$2.7B	$3.6B	+29%
2018	$2.7B	$2.7B	$3.5B	−15%
2017	$3.2B	$3.2B	$4.3B	−16%
2016	$3.8B	$3.7B	$4.6B	−8%
2015	$4.1B	$3.8B	$4.7B	+7%
2014	$3.9B	$3.5B	$4B	+4%
2013	$3.7B	$3.4B	$3.7B	+10%
2012	$3.4B	$3.3B	$3.9B	−3%
2011	$3.5B	$2.8B	$3.5B	+24%
2010	$2.8B	$2.6B	$2.8B	n/a

Companies in Insurance - Property & Casualty nearest White Mountains Insurance's size, closest first, today.

Company	Market cap
WTMWhite Mountains Insurance	$5.3B
MCYMercury General	$5.7B
SIGISelective Insurance	$5.7B
RLIRLI	$5.9B
AXSAxis Capital	$7.5B
PLMRPalomar	$3.7B
THGHanover Insurance	$8.3B
KNSLKinsale Capital	$8.3B
SLDESlide Insurance	$3.3B
SPNTSiriusPoint	$3B
SKWDSkyward Specialty Insurance	$2.7B
Peer median	$5.7B